Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!helios!tamuts.tamu.edu
From: packman@tamuts.tamu.edu (Wally Strzelec)
Newsgroups: comp.unix.wizards
Subject: Password Pipe
Message-ID: <13766@helios.TAMU.EDU>
Date: 26 Mar 91 18:50:09 GMT
Sender: usenet@helios.TAMU.EDU
Organization: Texas A&M University
Lines: 41

Howdy.... I am writing a short program that will allow me to change the
password on a remote machine.  To do this I am trying to use popen and
feed it the "/etc/passwd" command on the remote machine. The problem
is that it seems that the passwd command doesn't accept anything that
I send down the pipe.  Can someone please tell me where I am messing
up.  The following is my test:

#include <stdio.h>
  main (argc, argv)
int argc; char *argv[];
{
  char line[25], pass[9], user[9];
  FILE *pi, *popen();

  strcpy(user, argv[1]);
  strcpy(pass, argv[2]);

  printf("%s %s\n", user, pass);

  sprintf(line, "/bin/passwd %s ", user);

  pi = popen(line, "w");
  if(!pi) {
    exit(1);
  }

  fprintf(pi, "%s\n", pass);
  fprintf(pi, "%s\n", pass);
  
  pclose(pi);
  exit(0);
}

	Thanks....
	Wally Strzelec
	Texas A&M University
	Unix System Administrator
	packman@tamuts.tamu.edu

These are my own opinions and do not necessarily reflect those of
Texas A&M University.